6

6 - 56

For price, delivery, and to place orders, please contact Hittite Microwave Corporation:

20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373

Order On-line at www.hittite.com

The circuit board used in the final application should use RF circuit design techniques. Signal lines should have

50 ohm impedance while the package ground leads and backside ground slug should be connected directly to

the ground plane similar to that shown. A sufficient number of via holes should be used to connect the top and

bottom ground planes. The evaluation circuit board shown is available from Hittite upon request.

Evaluation PCB

List of Materials for

Note: The evaluation PCB for the HMC394LP4 contains

10K Ohm pull up resistors for each of the five control inputs

A0 through A4. Programming the 31 distinct division ratios

consists of installing or removing jumpers S1 through S5, as

shown above. Jumper S6 must always be installed to provide

ground to pin 20.

HMC394LP4 Evaluation

PCB Truth Table

Function

S1

S2

S3

S4

S5

Output Low

0

0

0

0

0

/ 2

1

0

0

0

0

/ 3

0

1

0

0

0

/ 4

1

1

0

0

0

--

-

-

-

-

/ 32

1

1

1

1

1

Note: 0 = Jumper Installed.

1 = Jumper Not Installed.

Item

Description

J1 - J3

PCB Mount SMA RF Connector

1.0 μF Tantalum Capacitor

.01 μF Capacitor, 0603 Pkg.

C5 - C8

1000 pF Capacitor, 0603 Pkg.

R1*

Resistor SIP 10 K ohm

S1 - S6

Jumper (shunt) 2mm

U1

HMC394LP4 / HMC394LP4E

5-Bit Counter

PCB

104435 Eval Board

[1] Reference this number when ordering complete evaluation PCB

[2] Optional components.

GaAs HBT PROGRAMMABLE

5-BIT COUNTER, DC - 2.2 GHz

v08.0607